Grinding machine



Oct. 24, 1950 A. N. EMMONS GRINDING MACHINE 2 Sheets-Sheet 1 Filed Dec.21, 1945 IN ENTOR.

ATTORNEY Oct. 24, 1950 Filed D80. 21, 1945 A. N. EMMONS GRINDING MACHINE2 Sheets-Sheet 2 11v ENTOR.

Patented Oct. 24, 1950 GRINDING MACHINE Arthur N. Emmons, Nedrow, N. Y.,assignor to Porter-Cable Machine Company, Syracuse,

N. Y., a corporation of New York Application December 21, 1945, SerialNo. 636,358

1 This invention relates to grinding machines of the abrasive belt type,and has as a general object a machine of this type embodying a structureby which both line contact and platen operations can be performedconsecutively-with a minimum of effort and time, the arrangement beingsuch that the structure for the platen operation does not in the leastinterfere with line contact grinding, or buffing. The invention has as afurther object a machine embodying the advantages abOve referred to andwherein the structure is such that elongated pieces of work can beground or buffed in the same manner that those operations are nowperformed on a conventional exposed grinding or bufling jack.

The invention consists in and in the combinations and constructionshereinafter set forth and claimed.

In describing this invention, reference is had to the accompanyingdrawings in which like characters designate corresponding parts mall theviews.

Figure l is a side elevational view embodying my invention.

Figure 2 is a front elevational view (if the machine. Figure 3 is asideelevational view, looking to, the left in Figure 2, with the upperportion of the frame in section.

Figure 4 is a fragmentary sectional view taken on line 4-4, Figure 3,illustrating the mounting of the platen.

- The machine consists of a vertically extending enclosed frame in whicha contact roll, pulley and platen are mounted, and provision is made forsupplying a coolerant fluid to the abrasive belt and for receiving chipsproduced during .the grinding or buffing operations. I The frameconsists of a base section It, the lower portion H of which formsarelatively-large tank for the coolerant fluid. The upper portion of theframe is in the nature of a housin having a rear wall [2, side wall l3,and a forward wall [4. The housing is enclosed by a door [5 hinged tothe rear wall I2 and forming, when closed a side wall opposite the walll3. The upper wall I 6 of the base portion [0 is provided with anopening I1, and the forward wall thereof with an opening [8. The upperhousing is mounted over the opening I! and communicates with theinterior of the base Ill.

The forward wall l4 of the upper housing inclines rearwardly at an anglein the neighborhood of A contact roll is arranged in the lowof a machinethe novel f eatures" 3 Claims. (Cl. 51 135) er portion of the housingand is journalled in thesuch as to effect rotation of the contact roll,as-

by conventional pulleys and belts arranged within the enclosed guard 23.

Anidler pulley 24 is journalled in the upper end of the housing on ablock 25 which is ad-, justable'toward and from the contact roll bymeans of the crank 26 and screw 21. An abrasive belt 28 is trained overthe contact roll 2:; and the upper pulley 24. The axis of the pulley 24is adjusted to properly track the belt by a screw 29." The forwardinclined wall of the upper portion of the frame is provided with anopening to. expose the outer run. of the belt, and this opening extendsdownwardly below the contact roll 20, seeFigure 3. The exposed portionof the belt is backed up by a platen 30 mounted upon a sup-v port 3|having a rearwardly extending web 32 formed with an open slot to receivea shank 34 extending inwardly from a pad 35 secured to the side wall I3of the housing, as by screws 36. The shank 34 is flattened off on theupper and lower sides, whereby the platen support 3| is adjustabletoward and from the outer run of the belt;

but is held against rotation about the axis of the pad 35. The supportis secured in adjusted position by means of a stud 3B threading intothe, shank 34 and clamping the web 32 against the pad, as shown inFigure 4. The stud 38 is formed with an outwardly extending projection39 which is formed with a threaded bore to receive a screw 40 carried bythe door l5 and which serves to secure .the'door in closed position.vThe purpose of the door is to expose the ends of the contact roll andpulley 2,4 to permit removal of the abrasive belt, and also to permitadjustment of the platen support 3 l.

The rear wall of the frame extends rearwardly, as at 42, to form a spaceor compartment 43 to permit elongated work pieces to be operated upon bythe abrasive belt passing over the contact roll l3; as indicated by thedotted line 45.

With this arrangement, long pieces of work can be ground or buffed byextending them through the opening in the front Wall of the frame andthe opening I! in the top wall of the base member, and during suchoperation the exposed portion of the abrasive belt between the contactroll 20 and the pulley 25 does not cause any interference orinconvenience due to the fact that this portion of the belt inclinesrearwardly, see Figures 1 and 3.

A coolerant pump 41 is mounted upon the lower portion I l of the frameand is operated by a motor 48, the pump having a discharge pipe 49extending upwardly of the side wall l3 and inwardly through said wall toa discharge nozzle 50 which functions to atomize the coolerant anddischarge the same against the rear run of the belt 28. This arrangementcreates a mist of coolerant within th upper housing of the frame andprovides a supply of coolerant to the belt.

Excess coolerant is thrown from the belt against the forward wall M asthe belt travels over the upper pulley 24, and this excess coolerant isavailable to flow down the exposed portion of the belt and is dischargedtogether with the chips from the grinding operations as the belt travelsaround the contact roll 20. A chip receiving drawer 52 is arranged inthe frame below the contact roll 20 and is provided at its inner endwith a series of screens 53 to permit the coolerant to discharge intothe tank portion II from whence it is continually re-circulated by thepump 41. The forward wall of the frame is provided with a trough 56, theupper walls of which flare outwardly, as at 51, and the bottom wall 58of which inclines downwardly through the opening 18 to discharge anycoolerant or material that may be discharged from the belt 28. A workrest 59 extends across the face of the belt in proximity to the lowerend of the platen 30 and is adjustably mounted upon the side wall l3 ofthe upper housing.

It will be apparent that a wide variety of grinding and buffingoperations can be quickly and conveniently performed on this machine.For example, all grinding operations, such as flat grinding, bevels,radii, etc., usually performed on a platen type grinder, can be done onthis machin and, in addition thereto, all free hand grinding and buflingoperations can be done on the portion of the belt in contact with thecontact roll 20, including work pieces of long or irregular shape, andall of these operations are performed while the belt is supplied with acoolerant which heretofore has not been practical with the conventionalwheel type grinding and bufiing jacks.

What I claim is:

1. A grinding machine of the type. described comprising a hollow base, avertically extending enclosed housing mounted on said base, a con-- tactroll journalled in the housing, a pulley journalled in the housing abovethe contact roll, an abrasive belt trained over said roll and pulley,the forward and bottom'walls of said housing being formed with anopening, the :opening' in the forward wall being arranged to expose aportion of said abrasive belt and the forward portion of the peripheryof said contact roll, and said opening extending a substantial distancebelow said roll, the top and forward walls of said base being formedwith an opening in register with the opening in the bottom and forwardwalls of said housing, the top wall of said base extending rearwardlyfrom the housing to permit elongated work pieces to be moved intoengagement with the abrasive belt on the lower portion of said contactroll, and motion transmitting means to effect rotation of said roll.

2. A grinding machine of the type described comprising a hollow basemember, a vertically extending enclosed housing mounted on the top wallof the base and being formed with an opening in the forward wall and thebottom wall, a contact roll journalled in the housing with the peripheryof said roll extending through the opening in the forward wall of thehousing and forwardly of said forward wall, a pulley journalled in thehousing above said contact roll, an abrasive belt trained over said rolland pulley and having an intermediate portion exposed through theopening in the front wall of the housing, the top and forward walls ofsaid base being formed with openings in register with the openings inthe bottom and forward walls of said housing, the top wall of said baseextending rearwardly from the housing to permit elongated work pieces tobe manipulated through said openings into engagement with the abrasivebelt on the lower portion of said contact roll, and motion transmittingmeans to effect rotation of said roll.

3. A grinding machine of the type described comprising a hollow base, anenclosed housing formed with an opening in the lower portion of theforward wall and in the bottom wall thereof, the top and forward wallsof said base mem-' her being formed with openings, and said housingbeing mounted upon the base with the openings in the housing in registerwith the openings in said base, the forward wall of the housinginclining rearwardly and upwardly, a contact roll journalled in thehousing with the forward portion of the roll extending forwardly throughthe opening in the front wall of the housing, a pulley journalledin theupper portion of the housing, an abrasive belt trained over said contactroll and pulley with a portion of the belt exposed through the openingin the forward Wall of the housing, a platen mounted in the housing inback of the exposed portion of said belt, said platen being inclinedrearwardly and upwardly from said contact roll, the top wall of saidbase extending rearwardly from the rear wall of the housing to permitelongated work pieces to be manipulated through said openings againstthe under portion of said contact roll, and motion transmitting meansoperable to effect rotation of said roll.

ARTHUR N; EMMONS.

REFERENCES CITED The following references are of record in the file ofthis patent: 1

UNITED STATES PATENTS Number Name Date 1 ,404,752 Furber Jan. 31, 19221,642,171 Reavis Sept. 13, 1927 2,089,808 Ocenasek Aug. 10, 19372,165,566 j I Meakin July 11, 1939 2,232,149- Tautz Feb. 18, 19412,273,696 Ducker Feb. 17, 1942 2,318,052 Bramble et al. May 4, 19432,367,107 Emmons Jan. 9, 1945

